Create a list of list and take the mean

Hi everyone

I am new to Matlab (I came from a Python background).

I have a question about creating a list of arrays and calculating their componentwise means. I know how to this in python using numpy array. I tried to apply the same logic in Matlab but somehow it does not work.

Please find below one example. I want to calculate the componentwise mean of aps. Perhaps, I used the wrong data structure for the aps?

Thank you very much.

aps = {};
for i = 1:length(locs)
    aps{i} = [i i+1 i+2];
end 

Answer 1

[Walter Roberson]

cellfun(@mean, aps) 

[Tung]

Thanks. I tried this code but it seems that it does not return the result that I wanted. Perhaps, my explanation above is not clear.

For the example, suppose that

aps{1} = [1 2 3 4 ], aps{2} = [2 3 4 5], aps{3} = [3 4 5 6]

The answer that I got using your code is [2.5, 3.5, 4.5]. This is an array of size 1x3. It seems that the code returns the average of each array in aps.

However, the anser that I want (the comonentwise average) should be be an array of size 1x4. The first element of this array should be (1+2+3)/ 3 =2.

I hope this makes things clearer.

[Alexander]

apsMean = mean(cell2mat(aps'))

should do the work for the sample above.

One mean too much. Copy paste error. I corrected it. Sorry.

[Voss]

mean(vertcat(aps{:}),1)

[Tung]

That makes sense. My understanding is that the function cell2mat and vertcat transform the aps into a 2D-array. Once it is done, we can calculate the mean on one of the axes. This is similar to Python. Thank you both!